Among the hottest trends in collection development are tools that help libraries more efficiently crunch their numbers to make data-driven decisions. But while the tools are new, using data to make selections is not. Data-driven decisions have been on the rise in libraries for years. Anna Mickelsen, Springfield City Library, MA, explains why she uses data for collection development: “I use stats to get a look at the bigger picture of the whole library’s collection and how the different parts compare to one another. Collection decisions shouldn’t be made in a vacuum, and statistics are sometimes the only solid information I have to work with.”